<template>
  <u-popup
    v-model="show"
    safe-area-inset-bottom
    border-radius="20"
    closeable
    mode="bottom">
    <view class="container">
      <view class="title">
        签名
      </view>
      <view class="handCenter" :style="getStyle">
        <!-- v-if="show" -->
        <canvas
          class="hand-writing"
          disable-scroll
          canvas-id="__signature__canvas"
          @touchstart="uploadScaleStart"
          @touchmove="uploadScaleMove"
          @touchend="uploadScaleEnd"
        />
      </view>

      <view class="buttons">
        <text class="button button_rewrite" @click="rewrite">
          重签
        </text>
        <text class="button button_submit linear-gradient" @click="submit">
          提交
        </text>
      </view>
			
      <view class="safe-area" />
    </view>
  </u-popup>
</template>

<script>
/**
 * this code copy from github
 * Modify by yxk
 * @see https://github.com/aoobao/signature/tree/master/components/SignaturePad
 */	
  import { FileQueryOneByBatch, FileDeleteById } from 'API/file.js'

  import UPopup from './u-popup.vue'
  import Handwriting from './signature.js'
  import { BASE_URL_FN } from '@/config.js'

  const CANVAS_ID = '__signature__canvas'
  const WIDTH = 710

  export default {
    name: 'WkPopupSign',
    components: {UPopup},
    props: {
      value: {
        type: String,
        default: null
      }
    },
    data() {
      return {
        canvasId: CANVAS_ID,
        show: false,
        width: '100%',
        height: '500rpx',
			
        fileData: null,
        tempFilePath: null
      };
    },
    computed: {
      getStyle() {
        return `width:${this.width};height:${this.height};`;
      }
    },
    watch: {
      show(val) {
        if (!val) {
          // 关闭
          if (this.reject) {
            this.reject();
          }
          this.fileData = null
          this.tempFilePath = null
        }
      }
    },
    methods: {
      sign() {
        return new Promise((resolve, reject) => {
          this.resolve = resolve;
          this.reject = reject;
          if (this.value) {
            this.getImage()
          } else {
            this.initDraw()
          }
        })
      },
      initDraw(scale = 1) {
        const width = uni.upx2px(WIDTH)
        const color = '#000'
        this.width = width + 'px';
        this.height = (width / 2.6) + 'px';
        this.show = true;
        setTimeout(() => {
          let query = uni.createSelectorQuery().in(this);
          let ctx = uni.createCanvasContext(CANVAS_ID, this);
				
          this.handwriting = new Handwriting({
            lineColor: color,
            slideValue: scale,
            canvasName: CANVAS_ID,
            ctx: ctx
          });
          query
            .select('.handCenter')
            .boundingClientRect(rect => {
              this.handwriting.setSize(rect);
              this.handwriting.setBgColor('#FFFFFF')
              if (this.tempFilePath) {
                this.$nextTick(() => {
                  ctx.drawImage(this.tempFilePath, 0, 0, rect.width, rect.height)
                  ctx.draw() // 绘制
                  this.handwriting.linePrack.push('')
                })
              }
            })
            .exec();
        }, 500);
      },
      getUrl(path) {
        let url = BASE_URL_FN() + (path.startsWith('/') ? path.replace('/', '') : path)
        const token = uni.getStorageSync('token') || ''
        const appid = uni.getStorageSync('appid') || ''
        const arr = []
			
        if (token) {
          arr.push(`c=${token}`)
        }
        if (appid) {
          arr.push(`k=${appid}`)
        }
        if (arr.length > 0) {
          return url + '?' + arr.join('&')
        } else {
          return url
        }
      },
      /**
       * 通过请求挂载图片
       */
      getImage() {
        const appid = uni.getStorageSync('appid') || ''
        const header = {
          'Admin-Token': uni.getStorageSync('token') || ''
        }
        if (appid) {
          header.k = appid
        }
        const that = this
        FileQueryOneByBatch({
          batchId: this.value
        }).then(res => {
          if (res) {
            let path = that.getUrl(res.url)
            that.fileData = res
					
            uni.downloadFile({
              url: path,
              header,
              success: fileRes => {
                that.tempFilePath = fileRes.tempFilePath
                uni.getImageInfo({
                  src: that.tempFilePath,
                  success: data => {
                    // console.log('imageInfo: ', data)
                    uni.getSystemInfo({
                      success: info => {
                        const scale = uni.upx2px(WIDTH) * info.pixelRatio / data.width
                        that.initDraw(scale)
                      }
                    })
                  },
                  fail: () => {
                    that.initDraw()
                  }
                })
              },
              fail: () => {
                that.tempFilePath = null
                that.initDraw()
              }
            })
          } else {
            that.tempFilePath = null
            that.initSign()
          }
        }).catch(() => {})
      },
		
      /**
       * 删除文件
       */
      deleteImgFile() {
        if (!this.fileData || !this.fileData.fileId) return
        const id = this.fileData.fileId
        this.fileData = null
        FileDeleteById({
          id: id
        })
      },
		
      /**
       * 上传签名图
       */
      uploadSignature(path) {
        const header = {
          'Admin-Token': uni.getStorageSync('token') || ''
        }
        const appid = uni.getStorageSync('appid') || ''
        if (appid) {
          header.k = appid
        }
        const formData = {
          type: 'img'
        }
        if (this.value) {
          formData.batchId = this.value
        }
			
        const that = this
        const requestConfig = {
          url: BASE_URL_FN() + 'adminFile/uploadBySingle',
          fileType: 'image',
          name: 'file',
          header,
          formData,
          success: res => {
            uni.hideLoading()
            let data = res.data
            if (typeof res.data === 'string') {
              try {
                data = JSON.parse(res.data)
              } catch (e) {
                that.$toast('网络异常，请稍后重试')
                that.reject('网络异常，请稍后重试')
                return
              }
            }
            that.fileData = data.data
            that.$emit('input', data.data.batchId)
            that.resolve(data.data.batchId)
          },
          fail: () => {
            uni.hideLoading()
            that.$toast('上传失败')
            that.reject('上传失败')
          }
        }
        requestConfig.filePath = path
			
        uni.uploadFile(requestConfig)
      },
		
      close() {
        this.show = false;
      },
      rewrite() {
        this.handwriting.clear();
      },
      submit() {
        let self = this;

        if (this.handwriting.isEmpty()) {
          // 未签字
          self.deleteImgFile()
          self.$emit('input', null)
          self.resolve(null)
          self.reject = null
          self.show = false
          return
        }
        uni.getSystemInfo({
          success: info => {
            self.canvasToTempPath(info.pixelRatio)
          },
          fail: () => {
            self.canvasToTempPath(3)
          }
        })
      },
      canvasToTempPath(pixelRatio = 3) {
        let self = this;
        const w = Number(self.width.replace('px', ''))
        const h = Number(self.height.replace('px', ''))
        uni.canvasToTempFilePath(
          {
            canvasId: CANVAS_ID,
            quality: 1.0,
            fileType: 'png',
            x: 0,
            y: 0,
            width: w,
            height: h,
            destWidth: w * pixelRatio,
            destHeight: h * pixelRatio,
            success(res) {
              console.log(res.tempFilePath)
              let path = res.tempFilePath;
              self.reject = null;
              self.uploadSignature(path);
            },
            fail(err) {
              let reject = self.reject;
              self.reject = null;
              reject({ type: 'err', err: err });
            },
            complete() {
              // 失败关闭
              self.show = false;
            }
          },
          this
        );
      },
      uploadScaleStart(event) {
        this.handwriting.uploadScaleStart(event);
      },
      uploadScaleMove(event) {
        this.handwriting.uploadScaleMove(event);
      },
      uploadScaleEnd(event) {
        this.handwriting.uploadScaleEnd(event);
      }
    }
  };
</script>

<style scoped lang="scss">
.container {
	width: 100%;
	/* height: 822rpx; */
	position: relative;
	background-color: #fff;
	overflow: hidden;
}
.title {
	width: 100%;
	display: flex;
	justify-content: center;
	color: $dark;
	font-size: $wk-font-large;
	font-weight: bold;
	margin-top: 25rpx;
}
.handCenter {
	margin: 25rpx auto 0;
	border: 1px dashed #979797;
}
.hand-writing {
	width: 100%;
	height: 100%;
}

.safe-area {
	width: 100%;
	height: 0;
  height: constant(safe-area-inset-bottom);
	height: env(safe-area-inset-bottom);
}

.buttons {
	width: 80%;
	margin: 25rpx auto;
	display: flex;
	justify-content: space-between;
}

.buttons .button {
	width: 200rpx;
	height: 60rpx;
	display: flex;
	justify-content: center;
	align-items: center;
	border-radius: 14rpx;
	font-size: $wk-font-base;
}
.buttons .button.button_rewrite {
	border: 1px solid $theme-color;
	background-color: #ffffff;
	color: $theme-color;
}

.buttons .button.button_submit {
	color: #fff;
	border: 0 none;
}
</style>
